Comparative study of Ni(ii) adsorption by pristine and oxidized multi-walled N-doped carbon nanotubes.

The principles and mechanisms of adsorption of Ni(ii) ions by well characterized pristine and oxidized N-doped multi-walled carbon nanotubes (N-CNTs) are described and discussed. The samples were synthesized by CCVD method using -butylamine as the carbon source and Ni(NO) + MgO as the catalyst and purified by treatment with HCl. The surface functionalization was performed using oxidation with a mixture of concentrated HSO and HNO.